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      1 // Copyright 2011 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_X64_LITHIUM_GAP_RESOLVER_X64_H_
     29 #define V8_X64_LITHIUM_GAP_RESOLVER_X64_H_
     30 
     31 #include "v8.h"
     32 
     33 #include "lithium.h"
     34 
     35 namespace v8 {
     36 namespace internal {
     37 
     38 class LCodeGen;
     39 class LGapResolver;
     40 
     41 class LGapResolver BASE_EMBEDDED {
     42  public:
     43   explicit LGapResolver(LCodeGen* owner);
     44 
     45   // Resolve a set of parallel moves, emitting assembler instructions.
     46   void Resolve(LParallelMove* parallel_move);
     47 
     48  private:
     49   // Build the initial list of moves.
     50   void BuildInitialMoveList(LParallelMove* parallel_move);
     51 
     52   // Perform the move at the moves_ index in question (possibly requiring
     53   // other moves to satisfy dependencies).
     54   void PerformMove(int index);
     55 
     56   // Emit a move and remove it from the move graph.
     57   void EmitMove(int index);
     58 
     59   // Execute a move by emitting a swap of two operands.  The move from
     60   // source to destination is removed from the move graph.
     61   void EmitSwap(int index);
     62 
     63   // Verify the move list before performing moves.
     64   void Verify();
     65 
     66   LCodeGen* cgen_;
     67 
     68   // List of moves not yet resolved.
     69   ZoneList<LMoveOperands> moves_;
     70 };
     71 
     72 } }  // namespace v8::internal
     73 
     74 #endif  // V8_X64_LITHIUM_GAP_RESOLVER_X64_H_
     75